Automatically-threading loom shuttle



Dec. 16, 1930. v. LINDSJO I AUTOMATICALLY THREADING LOOM SHUTTLE Filed April 7, 1930 AT UENEY' Patented Dec. 16, 1930 UNITED STATES PATENT OFFICE VEBNER. LINDSJO, F HOPEDALEMASSACHUSETTS, ASSIGNOR T0 DRAPER CORPORA- TION, OF I-IOPEDALE'MASSACHUS ETTS, A CORPORATION OF MAINE AUTOMATICALLY-THREADING LOOM SHUTT E Application filed April 7, 1930. Serial No. 442,232.

This invention relates to automatically threading loom shuttles and is more particu- 19 difliculty has been experienced in securing a proper and uniform tension on the thread and many attempts have been made to solve the problem and secure the same character of tension on the thread during the first pick 1:"; of the shuttle following replenishment as exists during subsequent weaving. Such prior thread tensioning devices have been variously contrived and in many cases the parts of the tensioning device have been mounted for relative movement. 7

One of the'objects of the present invention is to provide a tortuous thread tensioningdevice which will become effective on the first pick of the shuttle following replenishment and exert the same characterof tension on the thread that exists during subsequent weaving. The present invention is characterized by a substantially rigid wire or similar structure having its ends secured to opposite walls of the longitudinal-thread passage and provided with intermediate bent portions so designed and related that on the first pick of the shuttle following replenishment the thread will have imparted thereto the same character of tension as exists "during the weaving operation.

The invention and novel features thereof will best be made clear'from the following description and the accompanying drawings of one good form thereof. I

The single figure of the drawings represents in perspective thethreading end of an automatically threading shuttle provided with the present invention, the detachable bobbin holding features of the shuttle being omitted.

It is now the common practice to provide automatically threading shuttles with a threading device or block which serves to direct the thread into a preliminary threading position on the first pick of the shuttle following replenishment and on the return pick of the shuttle to complete the threading operation, so that thereafter the thread will lead from the side delivery eye,

In accordance with the present invention, the threading block may be of any usual type now Well known in the art, and mounted in the longitudinal passage of the block is a tortuous thread tensioning device containing the present invention.

The shuttle 1 is provided with the usual bobbin chamber 2 and frontward of the bob bin chamber is the side deliveryeye 3, While between the bobbin chamber and side, delivery eye the shuttle is provided with a longitudinal thread passage 4.

Mounted in the shuttle between the bobbin chamber and side delivery eye is the thread-V ing block5 between the side walls 6 and 7' of Which is formed the longitudinal thread passage. V

The tortuous course thread tensioning device, in accordance with the present invention, is mounted in the longitudinal thread passage and may be conveniently formed of a metal stripor wire having its end portions secured to-the opposite side walls of the thread passage, and betweenrthe secured ends of the strip or wire the tensioning device is provid ed with a series of, bends which impart to the thread a tortuous course onthe first pick of the shuttle following replenishment and maintain such tortuous course during subsequent weaving, whereby the thread is uniformly tensioned.

One end of the wire or strip is secured to the side wall f the thread passage, as indicated at 8, and the other endof the strip or wire is secured to the opposite wall 7 of the thread passage, as at 9, and between the two rigidly secured ends the strip or wire is bent or turned to provide the tortuous course tension to the thread.

From the secured end 8 the strip or wire is extended inwardly of the thread passage at 10 and formed into the thread deflecting loop 11 which has an opening for the passage of the thread thereinto between the bend 12 and the adjacent side wall 6 of the thread passage. The thread deflecting loop 11 is oliset from the central portion of the thread passage towards one side thereof and is formed into an upper arch 13 whichexten dstra n sversel-y of the thread passage towards the opposite wall thereof and preferably terminates at a point 14: slightly below the secured end 9 of the wire or strip. The function of the upper arch 13 is to direct the swirling thread int-o engagement with the thread deflecting loop 11 as the shuttle is picked following replenishment.

From the point 14 the strip or wire is turned inwardly at 15 to a point substantially central of the longitudinal thread passage and is there turned downwardly into a leg portion 16 which is laterally offset in the longitudinal thread passage from the thread deflecting loop 11.

From the lower portion of the leg 16 the wire or strip is turned upwardly at 17 andthen outwardly and downwardly at 18 at which pointthe wire or strip is formed into a lower arch 19 which extends transversely of the longitudinal thread passage, and functions to direct the swirling thread into engagement with a thread positioning and directing 7 loop 20.

The thread positioning and directing loop 20 is turned inwardly from the upper portion of the lower arch at 21 at a point below the secured end portion 9 of the strip or wire, so that as the thread swirls while being withdrawn from the shuttle it will pass into the thread positioning and directing loop 20 and there held from dropping downwardly below the lower end of the leg 16, and since the leg 16 is laterally offset from the thread deflecting loop 11, the thread takes a tortuous course about the leg 16 towards and through the thread deflecting loop 11 during the waving operation.

From the construction thus far described it will be apparent that on the first pick of the shuttle following replenishment, the swirling thread will be guided by the upper arch laterally of the thread passage into engagement with the thread deflecting loop 11 and will then be engaged by the lower arch 19 which will direct the thread into the thread positioning and directing loop 20 where the thread will be sustained and supported above the lower end of the leg 16, so that during weaving operations the thread will take a tortuous course about the leg 16, then laterally of the thread passage in and through the of? set loop 11.

Since the shuttle is subjected to sudden picking impulse and then suddenly brought to rest in the shuttle box, the thread will naturally become slackened slightly as the shuttle is arrested in the shuttle box, and in order that it may not drop below the end of the leg 16 at such times, the lower portion of the leg 16 is guarded by the lower arch 19 of the tortuous course tensioning device. Such guarding effect of the lower end of the 16 may be readily accomplished by engagement of the lower end of the leg with the lowerportion of the lower arch 19, so that throughout the weaving operation the tortuous course tensioning device will maintain constant .and uniform tension on the thread.

From the detailed description of the tortuous course tensioning device it will be noted that the end portions 8 and 9 of the tensioning device are secured to the opposite'walls of the thread passage, and between the fixed end portions the strip or wire is turned or bent to provide a thread deflecting loop 11 above the terminal end. portion 8, and is laterally offset from the central longitudinal axis of the thread passage. The upper arch 13 which constitutes a continuation of the strip or wire transversely of the thread passage will support the thread a as indicated by dotted lines when the replenishing operation has been completed, and when the shuttle is picked following replenishment the swirling thread will be guided into the thread deflecting loop 11. As the shuttle continues its picking movement to the opposite shuttle box, the thread will swirl about the thread deflecting loop 11 in contact with the lower arch 19 and will finally come to rest in the thread supporting and directing loop 20 which is laterally offset from the thread deflectiiig loop 11, and since the leg 16 is dis posed between or intermediate the thread defleeting loop 11 and the thread directing and supporting loop 20, it will be guided about the 16 towards and through the thread deflecting loop 11 as the shuttle moves towards the opposite shuttle box.

The thread supporting and directing loop 20 serves to maintain the thread in an upper position relative to the leg 16, and since the lower end of the leg 16 is guarded by the lower arch 19, the thread will be continuously given a tortuous course about the leg 16 towards and through the thread deflecting loop 11 during the first pick of the shuttle and subsequent weaving operations.

The tortuous course tensioning device as hereinbefore described constitutes a simple and effective means for applying the same uniform tension to the thread on the first pick of the shuttle following replenishment as exists during subsequent weaving, and as shown, the tortuous course tensioning device CJI thread passage and a side delivery eye, a

tortuous thread tension device between the bobbin chamber and side delivery eye having the ends thereof secured to the shuttle at opposite sides of the thread passage in ofi'set relation longitudinally of the thread passage, a thread deflecting loop formed in the tension device above one secured end thereof, a thread directing loop formed. below the other secured end of the tension device, and a leg between the two loops about which the thread passes from the directing loop on its way to the thread deflecting loop.

2. An automatically threading loom shuttle having a longitudinal thread passage and side delivery eye, a tortuous thread tension device in the longitudinal thread passage having one end secured at one side of the thread passage and turned to form a thread deflecting loop and the other end secured at the opposite side of the thread passage and turned to form a thread directing loop, said,

tension device being provided with a leg portion between the two loops laterally offset from the thread deflecting loop and about which the thread is directed by the directing loop as the thread passes laterally of the longitudinal thread passage through the hread deflecting loop.

3. An automatically threading loom shuttle having a longitudinal thread passage and side delivery eye, a tortuous thread tension device in the longitudinal thread passage having its ends secured to the oposite walls thereof and formed with a thread deflecting loop at one side of the longitudinal axis of the thread passage with which the thread is engaged as the shuttle is picked, a leg portion laterally offset from said loop, and a thread directing loop for sustaining the thread and directing it about the leg portion of the tension device as the thread is deflected laterally to the thread deflecting loop during weaving.

4. An automatically threading loom shuttle having a longitudinal thread passage and side delivery eye, a thread tension device in the longitudinal thread passage having its ends rigidly secured to the opposite walls thereof and intermediate bends forming a 0; thread deflecting loop at one side thereof,an

upper arch extending transversely of the thread passage for directing the swirling thread into engagement with said deflecting loop as the shuttle is picked, a leg portion laterally at one side of said loop, and a lower arch for directing the swirling thread into engagement with the leg portion that the thread may reeve about the leg'portion in a direction transversely of the longitudinal thread passage through the deflecting'loop during weaving.

5. Anautomatically threading loom shuttle having a longitudinal thread passage and side delivery eye, a tortuous course tension device in the longitudinal thread passage formed of wire the ends of which are secured at opposite sides of. the thread passage and having portions intermediate the fixed ends bent to form a thread deflecting loop at one side of the thread passage for engagement by the swirling thread on the first pick of the shuttle following replenishment, a

thread directing loop laterally offset from the thread deflecting loop, and a leg portion offset laterally from the thread deflecting loop and about which the thread is guided by the thread directing loop during weaving.

6. An automatically threading loom shuttle having a longitudinal thread passage and side delivery eye, a tortuous course tension device in the longitudinal thread passage having its ends rigidly secured to the opposite walls of the thread passage and intermediate bends forming (l) a thread deflecting loop at one side of the thread passage, 2) an upper arch extending transversely of th threadpassage, (3) a downwardly extending leg laterall offset from the thread deflecting loop, 4:) a lower arch extending transversely of the thread passage, and (5) a thread directing loop for supporting the thread and directing it about the leg on its way to the laterally offset deflecting loop.

7. An automatically threading loom shuttle having a longitudinal thread passageand a side delivery eye, a tortuous course tension device in the longitudinal thread passage having its ends rigidly secured to the opposite walls thereof and intermediate portions forming a thread deflecting loop at one side of the longitudinal thread passage, a thread supporting and directing loop laterally olfset from the deflecting loop, a lower arch for guiding the thread into the threadv support ing and directing loop,and a leg about which the thread is guided by the supporting and directing loop, the lower end of the leg being guarded by the lower arch to prevent escape of the thread from about the leg during weaving.

8. An automatically threading loom shuttle having a longitudinal thread passage and llOv a side delivery eye, a tortuous course tension device in the longitudinal thread passage having its ends rigidly secured to the-oppo-.

site Walls thereof and intermediate portions forming a thread deflecting loop at one side of the longitudinal thread passage, :t leg offset laterally of the thread passage from the thread deflecting loop, and 2; thread supporting and directing portion for supporting the thread between the upper and lower ends of the leg and directing it to and about the leg as the thread is drawn through the thread deflecting loop during eaving.

In testimony whereof, I have signed my name to tlns spee1ficat1on.

VERNER LINDSJO. 

